Update EXAMPLES.php
Updated receipt sending

Receipts actually have to be answered or they will be re-sent on each
login
Removed "type" attribute in setProfilePicture

not present in WP7 dll, so no need for it
Added profile picture checks

Checks for aspect ratio (square)
Checks for dimensions (max 640px)
Reduces quality to 50% (WhatsApp was nagging about file size)
Added thumbnail to setProfilePicture